Concrete mixer



F. D. ROBBINS CONCRETE MIXER Nov. 18, 1930.

Filed July 5, 1928 FRANK n'noBBINs, orfnnwnnno; onneoiv, .AssIGNon. or om ns 1T0 imjmx I Patented Nov. 18, 1930 LBOND, or .ivEWBEnG, onneon' npmicationflled'imy 5, 1132s Serial in. 290,604.

My invention relates'tolcemenit mixers of the batch type and has'for its primary ob; ject the mixing of the batch while in transit" *from the delivery of the aggregates within the mixer to the pointof discharge of the Q-materiaIs The mixer and the batch are raised and revolved from the time the agj A further object of myinvention resides ina mixer that' can be revolved and the aggregates disposed therein be mixed until the final discharge point is reached. This delivers a much more thoroughly mixed ag- .gregate and at the same time is an economy I in time as well.

Heretofore the mixer has been a stationary 1' plant and the mixed aggregateshave been therein to the. point of application and use.

In the'carrying of the aggregate in this revolve the mixer While in transit thereby delivering a completely mixed aggregate to the precise point of use.

I accomplish this result by providing a mixing chamber that normally rests with the open end being inclined upward to prevent the spilling of the aggregate during mixing and further providing simple and eflicient means for the raising and lowering of the mixer and the revolvingof the same during transit. This maybe accomplished by the passing of the hoisting line in a fixed path about. the mixer, and providing adiusting arms that predetermine the tilt of the mixer. This is essential because batches of difierent quantities weigh diflerent amounts.

With these and incidentalobjects in view, the invention consists in certain novel feaferred form of in gs which accompany of this specification, gregates are delivered into the mixerluntil the point of discharge is reached;

line 2+2 of 1, looking in the direction Fig. 3.is-a top, -plan viewjo fth'efmechathe hoisting and; mixin tures'j'of construction and combinationot parts,- thelessential elementsef which are;

set forthin'the appended claim, and a preinafter shown with reference to the draw and f orm a 'part In the'drawings:

new and improved-mixers being raised' by' a a line a'ssing over suitableblocl'r's supported by a oom'or other outrigger mechanism.f;

Fig. 2 is across "section View, takenl'on indicated,-

nism illustrated in F-ig." 1, the samebeing direction indicated. I H 3 I Fig. 4'is'ga cross section view, taken;on

line 4+4: ofFig. 3, looking in the direction indicated."

'-' taken on line 33 of Fig. 1, looking in the discharged from the mixer into a hoist or car v or barrow and the mixed aggregates carried Fig. -5 is a fragmentary, side elevation,

taken on line-5 5 of Fig; '2, lookingin the.

- direct-ionindicated; The object and purpose of this View is toi-illustrate adjusting mechanisms for predetermining the normal angle at which the mixer will be inclined during 7 g operation. LIkB'I'GfQIBIICQ characters refer to likepartsi throughout the several views; 1 point of use of the mixedaggregate, and to My new and improvedmixer is primarily intended as a mixer for mixing concrete aggregates durlng' the hoisting and delivery operations. It has been my experience as a building superintendent that concrete aggregates once mixed, set rapidly andthat {if the mixed aggregatesv are to 'beftransported embodiment of which is herei any substantial distance that the: aggregates have a tendency notonly to set but to sepaand other masses of concrete where substantial distances are to be'encounteredin' the v transportation of the mixed mass.

In new and improved mixer, the unmlxed aggregates-are del vered lnto the mlX- 0 rate with the heavier aggregates falling to ing chamber and the mixing occurs during the hoisting or transporting of the mixer to the point of discharge. a

' I accomplish these results through a mixer comprising a shell 1, preferably made having an enlarged base 2, and arestricted opening 3, through which the aggregates are to be admitted and from which thesame are to be delivered from the mixer. A plurality of inwardly extending finsor ribs4,-are disposed within the mixer, preferably extendingfrom the outward rim 5, of the mixing chamber to substantially the base or bottom 2, and 'in-' creasing in depth from the rim to. the base;

A structural yoke 6, extends across the base and therearound and extendinggsubstair tially to the center of the mixing chamber 1. A king bolt 7, is secured to the yoke and extends inwardly through; the center of the base 2, that acts as a. journal pin and sup port for the shell 1. A suitable bearing 8, is disposed within the central portion of the shell and alocking nut 9;main'tains the shell about the king bolt 7 ..Acsuitable cap 1 prevents the concrete aggregates entering within and around the hearing. A raceway or track llruns circumferentially ofthe shell 1, about which the hoisting line 12 passes and which are made to engage within the trackor raceway. c.

I have found bestresults obtain wherein the hoisting line makesjone complete turn a. about the drum. Oneend of the-line :12 is secured to the support 13, as a sheave block,

the line then passes about the shell and over the block 13, down to the hoisting mechaforms, all coming within the scope of the claim which follows.

lVhat' I claim is 1 In a concrete mixer, in combination with a mixing shell, a yoke encompassing the shell, a journal pin centrally disposed on the base of the yoke, said journal pin centrally disposed within the base of the shell about which t-he'shell isadapted for rotation, .a pair of supports, each having a slot being adjustably positioned relative to the' arms of the yoke. substantially near their. ends, a pair of guide rollers ournaled on the top of each support, afurcated U shaped band centrally disposed about the outer circumferenceof the shell and directly aligned with the guide rollers and a hoisting line passing once around the shell within the furcated U-shaped band andbetween the, two sets of guide, rollers, substantially as shown and; described and for the purposes set forth; p FRANICD; ROBBINS.

nism, not here shown, as the same maybe made of any suitable unit'adap'ted for the hoisting of a device of this kind. An arm 14 is secured to the yoke 6, and to which a trip line 15 is securedfThe aggregates are delivered into the mixing chamb'er at the V point of delivery of the aggregates and the mixer is then raisedthrough themanipulation of the hoisting line and, in doing so the mixing chamber is revolved. The revolving continuing until the point, of delivery of the aggregate is reached. Where the mixeris being'used, as in the erection of a building,

it may be necessary to raise 'or lower the mixer one or more times lnthe nitial or lower stories of the building, but as the building increases in helght suiiicient time and mixing will elapse to permit of a completely mixed aggregate when the pointofv delivery is reached. To maintain the mixer in a state of substantial equilibrium,the hoisting line passes between guide wheels 16 and 17 ,dis- 1 a posed upon the adjustable arm 18. The arm 18 has aslot 19, disposed therein which coacts with guide bolts 20 and 21, that are adapted for maintaining the arm fixed relative to the yoke 6. Thedistance that the.

guide wheels are disposedfrom the yoke predetermines the tiltof the mixer. 

